Linear wideband phase modulation system. Apparatus is provided for linear phase modulation utilizing a phase-locked loop. The apparatus includes a limiting circuit that restricts a range of a modulation signal that is coupled to a voltage controlled oscillator (VCO) associated with the phase-locked loop,...http://www.google.com/patents/US7675379?utm_source=gb-gplus-sharePatent US7675379 - Linear wideband phase modulation system
